BR102012010626A2 - saw blade for sawing hollow and molding profiles - Google Patents

Abstract

SAW BLADE FOR SAWING HOLLOW AND MOLDING PROFILES. A saw blade (1) is for sawing hollow or molding profiles, particularly metal. The saw blade (1) is particularly structured as a continuous saw band and has a basic body (2) and a plurality of teeth (10) formed by protrusions (3) of the basic body (2) to which it is attached. respectively an interleaved part (4) of a material which is harder than the material of the projections (3) and the basic body (2) is fixed. A portion of the teeth (10) is arranged in a repetitive group along the base body (2) of at least three unlocked beveled teeth (10). The group presents a first tooth (C ~ 1) with two chamfers (FC1 ~ 1, FC1 ~ 2), which run symmetrically towards the median longitudinal plane (9) of the saw blade (1), a second tooth (C2). with two chamfers (FC2 ~ 1, FC2 ~ 2) which run asymmetrically towards the median longitudinal plane (9) and a third tooth (C3) with two chamfers (FC3 ~ 1, FC3 ~ 2) which run asymmetrically towards to the median longitudinal plane (9).

Description

Patent Descriptive Report for: "SAW BLADE FOR SAWING HOLLOW AND PROFILING PROFILES".

TECHNICAL AREA OF INVENTION

The invention relates to a saw blade for sawing hollow profiles and / or molding profiles. The saw blade has a basic body and a plurality of teeth adjacent to the basic body with, respectively, a wire. The teeth are formed by protrusions of the basic body, where it is in turn fixed to an interleaved piece of material that is harder than the material of the protrusions and the basic body. At least part of the teeth is in a group of at least three unblocked teeth, repetitive along the basic body.

The saw blades of this type may consist mainly of a long saw band with a linear arrangement of the teeth in sequence, as a bow saw blade or as a circular saw blade. The base body is made of metal and the teeth are preferably composed at least in part of carbide or carbide inserts, the saw blade being particularly suitable for sawing metal materials.

ART STATE

A saw blade with a basic body and a plurality of teeth adjacent to the basic body with a wire is known from German patent application DE 42 00 423 A1. The teeth are in a repetitive group along the basic body, the group having at least three unlocked bevel teeth of different widths and heights. All teeth in the group in turn have at least two chamfers which are symmetrical with respect to the median longitudinal plane of the saw blade. Through this special group technique with unbraked teeth, the result is a particularly high cutting performance with stabilized straight work, without risk of the saw blade going sideways, which clearly differentiates the saw blade from teeth with locked teeth or those according to the roughing and cutting technique.

Another comparable saw blade is known from German patent application DE 43 00 622 A1.

A blade saw with a basic body and a plurality of teeth adjacent to the basic body with a wire is further known from German patent application DE 100 30 168 Al. The teeth are alternately unbraked, left locked and right locked. . In this sense, all teeth - or at least the locked teeth have the same widths and heights.

OBJECTIVE OF THE INVENTION The object of the invention is to provide a saw blade which is particularly well suited for sawing hollow and molding profiles, in particular of metal.

SOLUTION

The objective is achieved in accordance with the invention with the features of the independent claims.

Other preferred designs according to the invention are in the dependent claims.

DESCRIPTION OF THE INVENTION

The invention relates to a saw blade for sawing hollow and molding profiles. The saw blade has a basic body and a plurality of teeth adjacent to the basic body with a wire in turn. The teeth are formed by protrusions of the basic body, where it is in turn fixed to an interleaved piece of material that is harder than the material of the protrusions and the basic body. At least a portion of the teeth are in a group consisting of at least three repetitive beveled teeth, repetitive along the basic body. A first tooth in the group has two chamfers, the chamfers being symmetrical with respect to the median longitudinal plane of the saw blade. A second tooth in the group has two chamfers, which are asymmetric in relation to the median longitudinal plane of the saw blade, the first chamfer being in the first direction from the median longitudinal plane and having a first chamfer angle, and the second chamfering in the second second direction from the median longitudinal plane and having a second larger chamfering angle. A third tooth in the group has two chamfers, which are asymmetrical with respect to the median longitudinal plane of the saw blade, the first chamfer meeting in a first direction from the median longitudinal plane and having a first chamfer angle, and meeting each other. the second chamfer in the other second direction from the median longitudinal plane and having a second minor chamfer angle.

The first chamfering angle of the second tooth can be - but not necessarily - equal to the second chamfering angle of the third tooth. The second chamfering angle of the second tooth can be - but not necessarily - equal to the first chamfering angle of the third tooth.

Definitions

The saw blade teeth according to the invention are designed and arranged in a special manner in the group technique, according to which the group has at least three teeth. The group repeats along the length of the saw blade, eventually with other teeth interleaving. This special group technique is differentiated from the so-called thinning and clipping technique and also from the simple repetitive arrangement with one unlocked tooth, one left locked tooth and one right locked tooth.

The designation of the teeth "first tooth", "second tooth" etc. It first serves only to differentiate the teeth and does not necessarily refer to the sequence in which they are on the saw blade. In any case, one possibility is that the teeth are in precisely this sequence - eventually with the interleaving of other teeth.

Through its particular geometry, the new saw blade is particularly well suited for sawing hollow profiles or molding profiles, in particular metal. However, this does not mean that it is not equally possible to saw other workpieces. The saw blade teeth are designed to be very suitable for the removal of optional profile shavings - for example, single-cut, layered or arched - and in particular of steel-containing materials designed in hollow profile form and / or 15 of molding profile.

The saw blade can be designed primarily as a long saw blade with a linear and consecutive arrangement of the teeth in the form of a bow saw blade or as a circular saw blade.

Continued description Unlike a saw blade with symmetrically beveled teeth

The new geometry of the saw blade teeth has the advantage of locking hollow and molding profiles in the group because, due to the different chamfers in one part of the teeth, the burr is separated cleanly and evenly when passage or exit of the saw blade from the cutting channel in the workpiece.

The free cutting required for effective saw blade cutting is thus achieved.

through a special kind of polishing of the bevels of the teeth and thus the respective threads.

The disadvantage of a tooth projection caused by state of the art braking is that, due to braking tolerances, uneven tooth projections occur and thus the cutting channel may be irregularly formed and this may lead to burred cuts. The distribution of the volume to be lifted from chips and the distribution of cutting forces on the teeth occurs unevenly, which may cause the intended rectilinear path of the saw blade to be negatively affected. In this way the quality of the sawn surface is also reduced. In addition, the basic body of the saw blade 35 is weakened by a lock due to the deviation of the median longitudinal plane, and the large forces originating from the lifting of high yielding chips cannot be transferred to the basic body, and may cause teeth to break or rupture of the support material.

In comparison, the saw blade according to the invention has a plurality of advantages. The teeth or their wires are designed to achieve a low burr cut without vibration when sawing. In this way, subsequent work on the sawed workpiece is avoided or reduced. In order to achieve a very uniform width cutting channel and to avoid bias, the teeth are not locked. Instead, a portion of the teeth are asymmetrically polished, so it is possible to achieve very precise cuts (ie with small shape deviations) and low burr cuts, and to ensure a smooth and clean cut surface 10 also with a long life. Useful saw blade. Production of the new saw blade is cheaper compared to the locked saw blades as there is no additional braking work step.

There are many possibilities in terms of arrangement or sequence of teeth. In order to improve the oscillating sensitivity of the saw blade, the division between the teeth - that is, the distance between two adjacent teeth - may vary and, for example, may not be uniform or irregular.

The teeth preferably have a positive orthogonal cutting angle and, above all, an orthogonal cutting angle of about 1 ° to 20 °, in particular about 10 °.

The teeth may have different widths and preferably also 20 different heights. Such an arrangement is also referred to as width and height gradation. Each tooth is thus assigned a certain part of the cutting channel. The height of the first symmetrical tooth may be between 0.02 mm and 0.2 mm, in particular about 0.03 mm, greater than the height of the second and third asymmetrical teeth. The chamfering angle of the first symmetrical tooth is between 20 ° and 60 °, in particular about 25 °. The asymmetrical teeth have beveling angles between 5 ° and 45 °, and the beveling angles are combined together so that when sawing, the forces on the teeth are to some extent evenly distributed. Due to the beveling angle described above, a very stable tip of the respective tooth originates.

The set of teeth may have another or other not chamfered teeth

locked. To this belongs a fifth tooth, which has two chamfers, which are asymmetrical with respect to the median longitudinal plane of the saw blade, the first chamfer in the first direction from the median longitudinal plane and having a first chamfer angle, and the second chamfering along another second direction from the median longitudinal plane and having a second minor chamfering angle. A sixth tooth has two chamfers, which are asymmetrical with respect to the median longitudinal plane of the saw blade, the first chamfer being in the first direction from the median longitudinal plane and having a first chamfering angle, and the second chamfering in the second second direction from the median longitudinal plane and having a second larger chamfering angle. By increasing the number of unbraked asymmetrically beveled teeth - possibly by placing other symmetrically beveled teeth - the areas to be sawn into the cutting channel through the respective tooth are further reduced, thus cutting forces are evenly distributed. evenly, with less force on the respective tooth and further improving the quality of the sawn surface. This is also achieved through proper adjustment and coordination of the chamfering angles between them. In this case, it is preferred that there are asymmetrically beveled teeth not locked in the group, whose chamfering angles are in the precisely inverse arrangement next to another tooth. In other words, a first tooth has a first bevel angle in the left area of its wire and another second bevel angle in the right area of its wire, while another second tooth has the second bevel angle in the left area of its wire and the first bevel angle in the right area of your wire. The various unblocked symmetrically chamfered teeth preferably have conjugate chamfering angles - in particular about 45 ° - and have different heights and / or widths.

The saw blade is designed as a carbide saw blade with interleaved parts that are fixed to the protrusions of the base body. These carbide interleaved parts achieve the highest hardness and wear resistance when using the saw blade compared to high-cut steel (HSS). Interleaved parts are designed as molded bodies, which are produced as separate elements and then permanently bonded to the base body - in particular by welding or brazing.

The teeth of the saw blade have wires with a geometrically determined wire shape (as opposed to geometrically undetermined wire shape; see DIN 8580). The saw blade wire preferably consists of carbide, therefore in particular a steel forming alloy with tungsten and / or cobalt. In this case, tungsten is the hard material itself and cobalt - as well as possibly other alloying elements - the binder. However, for example, high performance fast cutting steels (HSS) may also be used.

In view of further hardness and wear resistance, the saw blade may be at least partly provided with a wear protection layer. In this case the wear protection layer extends at least over the end of the yarn and the yarn may have been pre-rounded to ensure better adhesion of the wear protection layer. especially hardness and thus better abrasion resistance when sawing, thus increasing the life of the saw blade. In addition, it is possible to choose that the coefficient of friction of the wear protection layer is relatively small, so as to achieve good chip output when sawing and reduced heating of the saw blade. At the same time, there is therefore a reduction in cutting forces compared to saw blades with no wear protection layer.

The wear protection layer may consist of hard material. This can be, in particular, TiN, TiCN1 TiAIN, CrN and DLC. The wear protection layer may consist of one or more layers. In the case of a single layer structure, the wear protection layer consists mainly of TiNj TiCN, TiAIN or CrN. Also several different layers - for example 2, 3 or 4 layers - can all form the wear protection layer. In the case of such a multilayer structure, the at least one intermediate layer consists mainly of TiN, TiCN, TiAIN or CrN1 and the surface layer disposed on the intermediate layer consists in particular of DLC. The wear protection layer is preferably applied by physical vapor phase deposition (PVD). This applies in the case of a multilayer structure for both the surface layer and at least one intermediate layer.

The teeth may have very different designs in terms of their widths, their chamfering angles and chamfer length. Thus, for example, at least a portion of the teeth - and in particular the so-called conductive tooth - may be designed to be no wider than the basic saw blade body. This is achieved by, for example, a relatively large chamfering angle. Such a tooth will have zero width within the group of teeth.

Advantageous embodiments of the invention result from the claims, the description and the figures. The advantages mentioned at the beginning of the description of features and combinations of various features are only examples and may act alternatively or cumulatively, without the advantages having to be necessarily achieved by embodiments according to the invention. Other features can be taken from the figures - in particular the geometries shown and the relative measurements of various components relative to each other, as well as their relative arrangement and actuation connection. The combination of features of different embodiments of the invention or features of different claims is also possible in a manner deviating from the chosen cross-references of the claims and is hereby promoted. This also refers to those features which are represented in separate figures or mentioned in their description. These features may also be combined with features of different claims. Likewise, the features set forth in the claims may not exist in the case of other embodiments of the invention.

The characteristics mentioned in the claims and description should be

understood in terms of its number, to exist precisely that number or to exist a number greater than the number mentioned, without the explicit use of the adverbial expression "at least". If it is a wire, for example, it must be understood that there is precisely one wire, two wires or several wires. If, on the other hand, if only 10 must indicate the precise number of a characteristic, the adjective "precise" will be used next to its characteristic.

D ESC RI BRIEF DOG OF FIGURES

In the following, the invention is explained and described based on preferred Embodiment Examples shown in the Figures.

Fig. 1 shows a side view of a section of a first example of a

realization of the new saw blade in a schematic representation.

Fig. 2 shows a top view of the saw blade according to Fig. 1.

Fig. 3 shows the saw blade according to Fig. 1 in a front view.

Fig. 4 shows an enlarged front view of exemplary embodiments of the teeth of the new saw blade according to Fig. 1.

DESCRIPTION OF THE FIGURES

Fig. 1 shows a side view of a first example embodiment of the new saw blade 1. Fig. 2 shows the corresponding top view of the saw blade

1. Further views of the saw blade 1 shown in Figs. 1 and 2 or their components are shown in Figs. 3 and 4. Figures 4a to 4f here individually show the six teeth 10 of the saw blade 1 according to Fig. 3.

In the following, reference is made to Figs. 1-4 for descriptive purposes of the

saw 1.

It is understood that Figs. 1 and 2 show only a section of the saw blade 1, which in the representation of Figs. 1 and 2 extends both left and right as well as downwards. In Figs. 1 and 2, the saw blade 1 is designed as a long saw blade with a median longitudinal plane 9. The median longitudinal plane 9 is in half along the length of the saw blade 1, as can be seen from in the overall picture of Figs 2 and 3 (see reference 9, respectively). However, the 35 saw blade 1 may also be a circular saw blade or a less long arc saw blade. The saw blade 1 itself consists of metal and serves to saw metal. The saw blade 1 has a basic body 2, of which only one cut is visible. The base body 2 has a plurality of protrusions 3, to which an interlayer 4 is in turn attached. The interlayer 4 is made of a material that is harder than the material of the protrusions 3 and the basic body 2 of the blade. of saw 1.

Preferably, the material of the insert 4 is a carbide. Between the protrusion 3 and the interlayer 4 is a junction area 5 to which is interlaced - mainly by brazing or welding - the interleaver 4 with the protrusion 3. The saw blade 1 is not shown on the scale. 1: 1, but so that the interleaved parts 4 are well recognizable. Interleaved parts 4 are in fact clearly smaller than the 10 protrusions 3.

The protrusion 3 with the insert 4 forms a tooth 10 with a thread 6 and a chip forming area 7. In addition, each tooth 10 has a rear face of the tooth

11, a front side of tooth 12, a bottom of tooth 13 and a free area 14.

At least a portion of the teeth 10 are in a repetitive group along 15 of the base body 2, the group having at least three unlocked beveled teeth 10. In the upper part of Fig. 3, there is shown in shading, for illustrative purposes, the special division of the multi-pronged effective wire sections 10, which are thus in turn assigned to a certain tapered portion of the duct channel. cut and pick up chips only there.

As particularly well recognizable in Figs. 3 and 4, the group at present

The example shows six different teeth C1, C2, C3, C4, C5 and C6. There are left and right with different chamfering angles w1, w2, w3, w4 and w5, all of which are shown only on the left side in Fig. 3 for ease of viewing. However, they also exist on the right side of the Figure - partly on other teeth 10.

The first tooth C1 is the tallest and narrowest tooth, the so-called conductive tooth. The first tooth C1 in the group has two chamfers FC1i and FCI2, which are at a chamfering angle w5 symmetrically with respect to the median longitudinal plane 9 of the saw blade 1.

A second C2 tooth in the group has two chamfers FC2i and FC22, which are

asymmetrically with respect to the median longitudinal plane 9 of the saw blade 1, the first chamfer FC2 ^ being in a first direction 15 from the median longitudinal plane 9 and having a first chamfer angle w2, and the second chamfer FC22 in another second direction 16 from the median longitudinal plane 9 and having a second larger chamfer angle w4.

A third C3 tooth in the group has two chamfers FC3i and FC32, which are asymmetrical with respect to the median longitudinal plane 9 of blade 10.

15

20

25

saw 1, the first chamfer FCS1 in the first direction 15 from the longitudinal plane 9 and having the first chamfer angle w4, and the second chamfer FC32 in the other second direction 16 from the longitudinal median plane

9 and having the second minor chamfering angle w2.

A fourth tooth C4 in the group has two chamfers FC ^ and FC42 which are under chamfer angle w5 symmetrically with respect to the median longitudinal plane 9 of the saw blade 1.

A fifth tooth C5 in the group has two chamfers FCS1 and FC52 which are asymmetrical with respect to the median longitudinal plane 9 of the saw blade 1, the first chamfer FCS1 being in the first direction 15 from the median longitudinal plane 9 and having a chamfering angle w3, and the second chamfer FC52 being in the other second direction 16 from the median longitudinal plane

9 and having a second smaller bevel angle w1.

A sixth tooth C6 in the group has two chamfers FCe1 and FC62 which are asymmetrical with respect to the median longitudinal plane 9 of the saw blade 1, the first chamfer FCe1 being along the first direction 15 from the longitudinal plane 9 and having the chamfering angle w1, and the second chamfering FC62 being in the other second direction 16 of the median longitudinal plane 9 and having the second greater chamfering angle w3.

With such an arrangement of teeth 10 in this special group technique, with non-locking teeth 10 and partly asymmetrical differing beveling angles, a particularly good cutting performance is achieved with a good straight saw blade travel 1, very sharp cuts. precise, low-burr, and a smooth, clean cut surface, while also achieving a long service life of saw blade 1 when sawing hollow and molding profiles.

In Fig. 3, the height differences h1, h2 and h3 between teeth 10 are further depicted.

In the preferred Embodied Example shown, the following values are thus gathered:

30

Tooth Height difference Chamfering angle 1 Chamfering angle 2 C1 - w5 w5 C2 h1 w2 w4 C3 h1 w4 w2 C4 h2 w5 w5 C5 h3 w3 w1 C6 h3 w1 w3 In this case, the following can be added: Size Range 1 Value Range 2 Preferred Value w1 5-25 ° 5-15 ° 9 ° w2 5-25 ° 8-20 ° 12 ° w3 10-30 ° 15-30 ° 22 ° w4 20-50 ° 30-40 ° 35 ° w5 20-60 ° 40-50 ° 45 ° Size Value range 1 Value range 2 Preferred value h1 0.01-0.3 mm 0.02-0, 2 mm 0.03 mm h2 0.02-0.6 mm 0.04-0.4 mm 0.06 mm h3 0.03-0.9 mm 0.06-0.6 mm 0.09 mm As shown In Fig. 3, in this preferred example the group consists of the sequence of teeth C1-C2-C3-C4-C5-C6. This group is repeated in the rest of the saw blade 1, and it is also possible to interleave other teeth 10 and / or to vary the arrangement of the group. Other examples of possibilities of an arrangement are the C1-C5-C6-C4- tooth sequences. C2-C3, C1-C6-C5-C4-C2-C3, C1-C6-C5-C4-C3-C2 and C1-C5-C6-C4-C3-C2.

REFERENCE LIST

1 Saw blade 2 Base body 3 Protrusion 4 Interval part 5 Joint area 6 Wire 7 Trimming surface 8 Chipping machining element 9 Medium longitudinal plane 10 Tooth 11 Tooth rear face 12 Tooth front side 13 Tooth bottom 14 Clearance 15 First direction 16 Second direction C1 First tooth C2 Second tooth C3 Third tooth C4 Fourth tooth C5 Fifth tooth C6 Sixth tooth

FC11 First chamfer of first tooth FCI2 Second chamfer of first tooth FC2i First chamfer of second tooth FC22 Second chamfer of second tooth FCS1 First chamfer of third tooth FC32i First chamfer of fourth tooth FC42 Second chamfer of fourth tooth FCÕ! first bevel of the fifth tooth FC52 second bevel of the fifth tooth FCe1 first bevel of the sixth tooth FC62 second bevel of the sixth tooth W1 first bevel angle W2 second bevel angle W3 third bevel angle W4 fourth bevel angle W5 fifth bevel angle

Claims (12)

1. Saw blade (1) for sawing hollow and / or molding profiles having a basic body (2) and a plurality of teeth (10) adjacent to the basic body (2) with respectively a wire (6), characterized by the teeth (10) are formed by means of protrusions (3) of the base body (2) to which an interleaving part (4) of a material which is harder than the material of the protrusions (3) and respectively is attached. of the base body (2), at least a portion of the teeth (10) are arranged in a repetitive group along the base body (2) of at least three unlocked beveled teeth (10), a first tooth (10, C1) have two chamfers (FCI1, FCI2) in the group, and chamfers (FCI1, FCI2) run symmetrically towards the median longitudinal plane (9) of the saw blade (1), a second tooth (10, C2) owns in the group two chamfers (FC2 !, FC22) which run asymmetrically towards the median longitudinal plane (9) of the saw blade (1), 15 of which that the first chamfer (FC2!) extends in a first direction (15) from the median longitudinal plane (9) and has a first chamfer angle (w2) and the second chamfer (FC22) extends in another second direction (16) of the median longitudinal plane (9) and has a second larger chamfer angle (w4) and a third tooth (10, C3) having in the group two chamfers (FCS1, FC32) which run asymmetrically towards the median longitudinal plane. (9) of the saw blade (1), the first chamfer (FC30 extending in a first direction (15) from the median longitudinal plane (9) and having a first chamfer angle (w4) and the second chamfer ( FC32) extends in another second direction (16) of the median longitudinal plane (9) and has a second smaller bevel angle (w2). A saw blade (1) according to claim 1, characterized in that the first chamfering angle (w2) of the second tooth (10, C2) ranges from 5 ° to 25 °, the second chamfering angle (w4) of the second tooth tooth (10, C2) vary between 20 ° and 50 °, the first chamfering angle (w4) of the third tooth (10, C3) varies between 20 ° and 50 ° and the second chamfering angle (w2) of the third tooth ( 10, c3) range from 5 ° to 25 °. A saw blade (1) according to claim 1 or 2, characterized in that the first tooth (10, C1) has a chamfering angle (w5) ranging from 20 ° to 60 °, particularly about 45 °. °. The cutting blade (1) according to claim 1, characterized in that the first tooth (10, C1) has a first height, the second tooth (10, C2) has a second height and the third tooth (10, C3). a third height, the first height being greater than the second and third height. A saw blade (1) according to claim 4, characterized in that the first height is between 0.02 mm and 0.2 mm, particularly approximately 0.03 mm greater than the second and third height. Saw blade (1) according to Claim 4, characterized in that the second and third height are equal. A saw blade (1) according to at least one of the preceding claims, characterized in that the group also has a fourth unlocked bevel tooth (10, C4) having two chamfers (FC4, FC42). that the chamfers (FC4 !, FC42) run symmetrically towards the median longitudinal plane (9) of the saw blade (1). Saw blade (1) according to claim 7, characterized in that the first tooth (10, C1) has a first height, the second tooth (10, C2) has a second height, the third tooth (10, C3) a third height and the fourth tooth (10, C4) a fourth height, with the first height being greater than the second and third height and the fourth height being smaller than the first, second and third height. A saw blade (1) according to claim 7 or 8, characterized in that the group also has the following unlocked bevel teeth (10): a fifth tooth (10, C5) having two chamfers (10). FCS1, FC52), which run asymmetrically towards the median longitudinal plane (9) of the saw blade (1), with the first chamfer (FC50 extending in a first direction (15) from the median longitudinal plane (9) and It has a first chamfering angle (w3) and the second chamfer (FC52) extends in another second direction (16) of the median longitudinal plane (9) and has a second smaller chamfering angle (w1) and has a sixth tooth (10, C6) of the second chamfer (FCe1, FC62), which run asymmetrically towards the median longitudinal plane (9) of the saw blade (1), with the first chamfer (FCe1) extending in the first direction (15 ) of the median longitudinal plane (9) and has a first chamfering angle (w1) and the second The chamfer (FC62) extends in the second other direction (16) of the median longitudinal plane (9) and has a second larger chamfer angle (w3). A saw blade (1) according to claim 9, characterized in that the first chamfering angle (w3) of the fifth tooth (10, C5) ranges from 15 ° to 30 °, the second chamfering angle (w1) of the fifth tooth tooth (10, C5) range from 5 ° to 15 °, the first chamfering angle (w1) of the sixth tooth (10, C6) range from 5 ° to 15 °, the second chamfering angle (w3) of the sixth tooth (10, C6) ) range between 15 ° and 30 °. Saw blade (1) according to at least one of the preceding claims, characterized in that the threads (6) of the teeth (10) have a cutting edge respectively and the wires (6) are provided with a protective layer against them. wear extending over the respective cutting edges. Saw blade (1) according to Claim 11, characterized in that the wear protection layer has a hard material, particularly TiN, TiCN1 TiAIN, CrN or DLC.